What are the exact parameters. Words like perfect, fine, etc. do not help.
What one hobbyist labels 'fine' another hobbyist does not.
pH, nitrates, nitrites, ammonia are most important.
Temp (which I personally think should always be on the low side) should be lower if he seems stressed. By lower, I'm talking 73F. If the tank is still at 74.5, I think that might be okay.
What else is in this tank? Any tankmates, and if so, what kind and how many?
Are there any abnormal bumps or the likes on his tail? Is his pouch swollen at all?